2004 Digital Polling Division Boundaries: Changes

Digital polling division boundaries for 2004 were compared to polling
division boundaries for 2006 and 2008 for select federal electoral
districts.Polling divisions were identified by change type: larger
than the comparison year, smaller than the comparison year, no change,
and new division.Original polling division data was downloaded in
December of 2009 from:
http://geogratis.cgdi.gc.ca/geogratis/en/option/select.do?id=1169
NOTES:Be aware that polygons marked as no change that show boundary
changes between the two comparison years can be 1) subdivided in one
year and not the other, or 2) have an area difference of less than 1000
square meters. Polling divisions were identified based on the federal
electoral district and polling division numbers, but not on any further
division.A change threshold of 1000 square meters was used based on a
previous analysis by Global Forest watch.Boundary changes that result
in an area change of less than 1000 square meters will register as no
change.Polygons identified as present in one year and not the other
should be visually checked.Some are the same (or similar) shape with
different polling division numbers, and some are truly new polling
divisions present in one shapefile and not present in the other.

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